ALBANY — Gov. Cuomo took his feud with Mayor de Blasio to a whole new level Thursday by accusing the ultra-progressive mayor of trying to engineer a “giveaway to developers.”

A day after meeting with de Blasio, the governor charged that the deal the mayor made with the real-estate industry to extend the 421-a tax-abatement program to help produce more affordable housing was a windfall for developers.

“A lot of people think the deal negotiated by the city is too rich for developers and not enough for workers,” Cuomo told reporters after touring the Greene County Correctional Facility near Albany on Thursday.

That brought a sharp rebuke from the Mayor’s Office. “This mayor and administration have proven themselves ardent supporters of working people and of the labor movement — nobody can argue that isn’t the case with a straight face,” said mayoral spokesman Wiley Norvell.

The mayor’s plan to revamp 421-a — which costs the city more than $1 billion a year in lost taxes — called for developers to set aside 25 percent to 30 percent of their units in new buildings as “affordable housing.” In return, the tax break was extended from 25 to 35 years.

Turning the tables on de Blasio, Cuomo said the mayor’s progressive agenda doesn’t give construction workers who build the housing “fair wages” and dismissed de Blasio’s comment that he was “frustrated” after a lobbying trip to Albany Wednesday.

“The mayor of New York is almost perpetually frustrated with Albany,” Cuomo said.

“The city is a creature of the state, so the state Legislature passes laws that affect the city. So when the mayor wants to make a change, he has to go to Albany and ask Albany.”

The body slams came as Cuomo supporters and labor-union leaders essentially called the mayor a hypocrite.

Sean McGarvey, president of North America’s Building Trades Unions, said that when de Blasio returned from touting his progressive agenda out of state, “he sides with wealthy developers who helped underwrite his campaign.”

“Given his recent public relations campaign designed to espouse his version of progressive ideals for the world beyond his own jurisdiction, I would expect Mayor
de Blasio, of all people, to understand that public subsidies should come with public responsibilities,” McGarvey said. Union leaders are demanding that de Blasio force the developers to pay union wages at all 421-a projects.

Cuomo also appeared to jab the Massachusetts-raised mayor for being late to the game.

“I am a New York City boy through and through,” the governor said with a grin. “I was born in New York City, raised in New York City. I know New York City very well… People in New York City vote for me. What we’ve done for New York City within the budget, I think, is unprecedented.”

“It’s also a little late in the day to be starting a theoretical debate because there’s only like nine (Albany legislative work) days left,” Cuomo added.

De Blasio’s camp said he was born in Manhattan and that City Hall sent others earlier to lobby in Albany for the mayor’s agenda.